Enable new callback API

- OnData() channel data handler.
 - ConditionalRun() for devices without incoming data.
 - Header file with common main(), to be extended with getDevice/addCustomOptions.
 - Update examples (MQ/Tutorial3) to use the new API and config.
 - NewSimpleMessage() for simpler creation of small messages (additional copy).
 - Replace SetProperty/GetProperty with fConfig access.
 - Runtime configurable channel names for common devices.
 - Configurable logging interval per channel.
 - FairMQMultiplier for distributing same data to multiple outputs.
 - Cleanup state machine messages.
 - Cmd option to toggle signal handling.
 - Simpler API for send/receive timeouts.
 - Enable --log-to-file.
 - Fix coverity issues, warnings.
 - Various code cleanup and minor tweaks.

fairmq/nanomsg/FairMQPollerNN.cxx

@@ -59,7 +59,7 @@ FairMQPollerNN::FairMQPollerNN(const vector<FairMQChannel>& channels)
     }
 }
 
-FairMQPollerNN::FairMQPollerNN(const unordered_map<string, vector<FairMQChannel>>& channelsMap, const initializer_list<string> channelList)
+FairMQPollerNN::FairMQPollerNN(const unordered_map<string, vector<FairMQChannel>>& channelsMap, const vector<string>& channelList)
     : items()
     , fNumItems(0)
     , fOffsetMap()